JP2024051268A - Surveying system and laser receiver - Google Patents

Abstract

The mechanical height of a surveying instrument is measured using a laser receiver. [Solution] A surveying system (1) comprises a rotary laser device (10) that emits a laser beam (LB) horizontally at a height (H) from a measurement reference point (RP2), a surveying instrument (30) installed at another measurement reference point (RP1), and a laser receiver (20) fixed to the front of the surveying instrument. The laser receiver has receiving sections at both ends of a light guide, and is equipped with a first vertical light receiving tube (23), a second vertical light receiving tube (25), and a horizontal light receiving tube (24) in an H-shape. The system identifies the collision position (235) of the laser beam from each receiving signal of the receiving section, detects the differential distance from the central position and whether the differential distance is on the positive or negative side of the central position, and measures the mechanical height (h) of the surveying instrument from the height (H) of the laser beam, the center distance (d1) between the receiver center (RC) of the receiver and the mechanical center (MC) of the surveying instrument, and the differential distance, depending on the positive/negative combination of the differential distance. [Selected figure] Figure 2

Description

The present invention relates to a laser receiver that receives horizontal laser light from a rotary laser device.

In surveying work such as architectural, civil engineering, and interior construction, a rotary laser device and a laser receiver are used for leveling. The rotary laser device is installed at a measurement reference point, has a rotating head equipped with a laser light source, and rotates a laser beam horizontally at a reference height. The laser receiver detects the collision position of the laser beam within a detection body equipped with a light receiving sensor, and detects the height (vertical) position of the laser receiver relative to the laser beam. For example, Patent Document 1 discloses a laser receiver that calculates the elevation difference of a measurement point from a measurement reference point by providing multiple photodiodes as light receiving sensors around a vertical axis and configuring the light receiving sensor to be movable in the vertical direction.

On the other hand, surveying work involves the use of surveying instruments such as total stations and three-dimensional scanners. When measuring an object using a surveying instrument, it may be necessary to measure the instrument height from the surface on which the instrument is installed to the center of the instrument. The instrument height is often measured manually by an operator using a tape measure or the like, but measurement errors are likely to occur. In response to this, for example, Patent Document 2 discloses a surveying instrument that measures the instrument height by pointing the telescope of the instrument diagonally downward and using distance measuring light to measure the instrument's installation surface without using a prism.

JP 2020-169921 A JP 2017-181427 A

Rotary laser devices and laser receivers are often used at surveying sites for leveling purposes, and surveying instruments are often used at surveying sites for measuring the coordinates of measurement points. The inventors wondered whether it would be possible to measure the mechanical height of a surveying instrument using these machines that are often used at surveying sites.

The present invention was made to solve such problems, and aims to measure the mechanical height of a surveying instrument by using a laser receiver that receives horizontal laser light from a rotary laser device and performs leveling.

In order to solve the above problem, the surveying system of the first aspect of the present invention comprises a rotary laser device that emits laser light horizontally at a certain height from a certain measurement reference point, a surveying instrument that is installed at another measurement reference point and has a machine height up to the machine center, and a laser receiver that is fixed to the front of the surveying instrument and receives the laser light, and the laser receiver comprises, as a light receiving sensor, a columnar light guide, light receiving sections arranged at both ends of the light guide, and an optical coupling layer that splits the laser light toward both ends of the light guide, and is arranged in an H-shape, a first vertical light receiving tube, a second vertical light receiving tube, and a horizontal light receiving tube, and the receiving It has a calculation processing unit connected to the light unit, and the calculation processing unit identifies the collision position of the laser light from each light receiving signal of the light receiving unit, detects the difference distance from the center position of the collision position and whether the difference distance is on the positive or negative side of the center position of the length of the light guide, and measures the mechanical height of the surveying instrument from the height of the laser light, the vertical center distance between the light receiver center of the receiver and the mechanical center of the surveying instrument, and the difference distance according to the positive/negative combination of the difference distances of the first vertical light receiving tube, the second vertical light receiving tube, and the horizontal light receiving tube.

In the surveying system of the second aspect, in the first aspect, when the differential distance between the first vertical light receiving tube and the second vertical light receiving tube is the same and both are negative values, the arithmetic processing unit calculates the machine height from the sum of the differential distance, the height of the laser light, and the center distance (Formula 1), and when the differential distance between the first vertical light receiving tube and the second vertical light receiving tube is the same and both are positive values, it is also preferable to calculate the machine height by subtracting the absolute value of the differential distance from the sum of the height of the laser light and the center distance (Formula 2).

In the surveying system of the third aspect, in the first aspect, the arithmetic processing unit subtracts the height change amount of the receiver center calculated from the trigonometric function of the absolute value of the difference distance of the horizontal light receiving tube from the sum of the height of the laser light and the center distance when the difference distance of the first vertical light receiving tube is a positive value, the difference distance of the second vertical light receiving tube is a negative value, and the difference distance of the horizontal light receiving tube is a positive value, and when the difference distance of the first vertical light receiving tube is a negative value, the difference distance of the second vertical light receiving tube is a positive value, and the difference distance of the horizontal light receiving tube is a negative value. The machine height is calculated (Formula 4), and when the difference distance of the first vertical light receiving tube is a positive value, the difference distance of the second vertical light receiving tube is a negative value, and the difference distance of the horizontal light receiving tube is a negative value, or when the difference distance of the first vertical light receiving tube is a negative value, the difference distance of the second vertical light receiving tube is a positive value, and the difference distance of the horizontal light receiving tube is a positive value, it is also preferable to calculate the machine height (Formula 5) from the sum of the height change of the receiver center, the height of the laser light, and the center distance, which is calculated from the trigonometric function of the absolute value of the difference distance of the horizontal light receiving tube.

In the surveying system of the fourth aspect, in any of the first to third aspects, a pair of left and right handles extending rearward are provided on the rear surface of the laser receiver so as to be slidably locked in the vertical direction, and it is also preferable that the center distance is fixed by fixing the handles to hooks provided on the surveying instrument.

In the surveying system of the fifth aspect, in any of the first to fourth aspects, it is also preferable that a storage recess is formed on the rear surface of the laser receiver to avoid interference with the display operation unit and telescope provided on the surveying instrument.

In addition, the laser receiver of the sixth aspect is a laser receiver that receives laser light emitted horizontally at a certain height from a certain measurement reference point and is fixed to the front of a surveying instrument installed at another measurement reference point, and the laser receiver is provided with a columnar light guide as a light receiving sensor, light receiving units arranged at both ends of the light guide, and an optical coupling layer that splits the laser light toward both ends of the light guide, and is provided with a first vertical light receiving tube, a second vertical light receiving tube, and a horizontal light receiving tube arranged in an H shape, and a calculation processing unit connected to the light receiving units, and the calculation processing unit is provided with a front It is also preferable to identify the collision position of the laser light from each light receiving signal of the light receiving unit, detect the difference distance from the center position of the collision position and whether the difference distance is on the positive or negative side of the center position of the length of the light guide, and measure the mechanical height of the surveying instrument from the height of the laser light, the vertical center distance between the center of the receiver of the receiver and the mechanical center of the surveying instrument, and the difference distance depending on the positive/negative combination of the difference distances of the first vertical light receiving tube, the second vertical light receiving tube, and the horizontal light receiving tube.

According to the present invention, the height of a surveying instrument can be measured using a laser receiver that receives horizontal laser light from a rotary laser device and performs leveling.

1 is an external perspective view of a surveying system according to an embodiment of the present invention. FIG. FIG. FIG. 4 is a rear view of the laser receiver of the surveying system. FIG. 2 is a side view of a laser receiver of the surveying system. FIG. 2 is a plan view of a laser receiver of the surveying system. FIG. 2 is a diagram illustrating a light receiving sensor of a receiver of the surveying system. FIG. 2 is a configuration block diagram of the surveying system. 13 is a diagram for explaining the calculation of the instrument height when the receiver of the surveying system is not tilted. FIG. 13A and 13B are diagrams illustrating detection of changes in left and right tilt by the photoreceiver of the surveying system. 13 is a diagram for explaining the calculation of the instrument height when the receiver of the surveying system is tilted. FIG.

Next, preferred embodiments of the present invention will be described with reference to the drawings. In the following description of the embodiments, the same names will be used for similar configurations, and duplicate descriptions will be omitted as appropriate.

Figure 1 is an external perspective view of a surveying system 1 according to an embodiment of the present invention, Figure 2 is a front view of a surveying instrument of the surveying system 1, and Figure 3 is a side view of the surveying instrument of the surveying system 1. The surveying system 1 comprises a rotary laser device 10, a laser receiver (hereinafter simply referred to as the receiver) 20, and a surveying instrument 30.

The rotary laser device 10 is equipped with a rotary head 11 equipped with a laser light source such as a light emitting diode (LED), a semiconductor laser (LD), or an SLED (Super Luminescent Diode). As shown in FIG. 1, the rotary laser device 10 is erected via a tripod and a leveling stand at a measurement reference point RP2 on the ground (plane) at the surveying site, and the rotary head 11 is rotated to rotate the leveling laser light LB so as to revolve around a horizontal reference plane 12 at a certain height H from the measurement reference point RP2. The rotary head 11 emits pulsed light that has been intensity modulated to a predetermined frequency as the laser light LB.

The surveying instrument 30 is a motor-driven total station or a three-dimensional laser scanner. As shown in FIG. 1, the surveying instrument 30 is installed via a tripod at another measurement reference point RP1 on the ground (plane) at the surveying site. As shown in FIG. 2 and FIG. 3, the surveying instrument 30 includes a leveling stand 31 on the tripod, a base unit 32 detachably attached to the leveling stand 31, a base unit 33 mounted on the base unit 32 so as to be horizontally rotatable 360° around the axis H-H, and a telescope 34 mounted in the central recess of the base unit 33 so as to be vertically rotatable around the axis V-V. The surveying instrument 30 includes a main display/operation unit 35 on the rear surface of the base unit 33 and a sub-display/operation unit 36 on the rear surface of the base unit 33. Both the main display/operation unit 35 and the sub-display/operation unit 36 are touch-panel type liquid crystal displays, and the surveying instrument 30 can be operated and the measurement results can be displayed from either unit. The surveying instrument 30 emits distance measuring light MB (see FIG. 3) from the telescope 34, receives the reflected light from the object to be measured, and measures the distance and angle to the object to be measured according to the phase difference or time-of-flight difference of the received light signals. The mechanical center MC of the surveying instrument 30 is set within the telescope 34, is the measurement starting point of the distance measuring light MB, and is set on the axis H-H and the axis V-V.

The receiver 20 is fixed to the front of the surveying instrument 30. As shown in FIG. 2, the receiver 20 comprises a case 21, a first vertical receiver tube 23, a horizontal receiver tube 24, a second vertical receiver tube 25, and a display operation unit 22. The first vertical receiver tube 23, the horizontal receiver tube 24, the second vertical receiver tube 25, and the display operation unit 22 are arranged on the front of the case 21. The display operation unit 22 is a touch panel type liquid crystal display, which is arranged in the margins of the receiver tubes 23, 24, and 25, and allows the receiver 20 to be operated and the measurement results to be displayed.

Figure 4A is a rear view of the receiver 20, Figure 4B is a right side view of the receiver 20, and Figure 4C is a top view of the receiver 20. The receiver 20 is provided with a pair of left and right handles 27 extending rearward from the rear surface of the case 21. The handles 27 have engagement parts 271 (see Figure 4B) cut into an angular or semicircular shape on the inner surface. As shown in Figure 3, the handles 27 are fixed to hooks 37 provided on the left and right sides of the base part 33 of the surveying instrument 30 in a state where the engagement parts 271 are centered by the notches. In addition, the handles 27 can be moved and fixed to the first position P1, second position P2, and third position P3 shown in Figure 4B by a known slide lock mechanism 29 formed in the vertical direction on the rear surface of the case 21 as shown in Figure 4A. The first position P1 is a position where the engaging portion 271 of the handle 27 is located above the second position P2 by one diameter of the horizontal light receiving tube 24, and the third position P3 is a position where the engaging portion 271 of the handle 27 is located below the second position P2 by one diameter of the horizontal light receiving tube 24. By moving the handle 27, the vertical position of the receiver 20 relative to the surveying instrument 30 can be adjusted, that is, the vertical position of the horizontal light receiving tube 24 can be adjusted, so that the measurable range MA (see FIG. 4B) of the receiver 20 can be expanded according to the height of the laser light LB. If the handle 27 is removed from the hook 37, the receiver 20 can be removed from the surveying instrument 30, and the receiver 20 and the surveying instrument 30 can be used as independent devices at the surveying site.

As shown in Figures 4A and 4C, the rear center of the case 21 of the receiver 20 has a storage recess 28 that runs vertically to avoid interference between the secondary display operation unit 36 of the surveying instrument 30 and the receiver 20, and between the telescope 34 of the surveying instrument 30 and the receiver 20.

2, the receiver 20 has the first vertical receiver tube 23, the horizontal receiver tube 24, and the second vertical receiver tube 25, which are light receiving sensors, housed in an H-shaped groove (not shown) formed on the front surface of the case 21, and arranged in an "H" shape. In detail, the central axis of the horizontal receiver tube 24 is aligned with the central position M of the length L of each of the first vertical receiver tube 23 and the second vertical receiver tube 25, and the receiver center RC is arranged in an "H" shape so that it is at the central position M of the length L of the horizontal receiver tube 24. The central position M of the first vertical receiver tube 23 and the second vertical receiver tube 25, the central position M of the horizontal receiver tube 24, and the position of the receiver center RC in the horizontal receiver tube 24 are measured in advance and stored as known values in the memory unit 203 described later. Furthermore, by fixing the receiver 20 to the surveying instrument 30 (fixing the handle 27 to the hook 37), the vertical positional relationship between the receiver center RC of the receiver 20 and the mechanical center MC of the surveying instrument 30 is fixed. When the receiver 20 is fixed to the surveying instrument 30, the receiver center RC and the mechanical center MC are separated from each other by d1 in the vertical direction. This center separation distance d1 is measured in advance and stored in the memory unit 203, which will be described later, as a known value. Note that the center separation distance d1 is measured at three stages, the first position P1, the second position P2, and the third position P3 shown in FIG. 4B, and each of these is stored in the memory unit 20.

Here, the first vertical light receiving tube 23, the horizontal light receiving tube 24, and the second vertical light receiving tube 25, which are the light receiving sensors of the receiver 20, will be described. The first vertical light receiving tube 23 and the second vertical light receiving tube 25 are arranged with their axial direction vertically, while the horizontal light receiving tube 24 is arranged with its axial direction horizontally, and all have the same configuration, so the configuration of the light receiving sensor will be described using the first vertical light receiving tube 23. Figure 5 is a diagram explaining the light receiving sensor (first vertical light receiving tube 23) of the receiver 20, and shows the side of the first vertical light receiving tube 23. In Figure 5, the left is the front of the case 21, which receives the laser light LB.

The first vertical light receiving tube 23 includes a columnar light guide 231, a light receiving unit 232 arranged at one end of the light guide 231, and a light receiving unit 233 arranged at the other end. The light receiving units 232 and 233 are photodiodes, avalanche photodiodes (APDs), or equivalent photoelectric conversion elements. The light receiving signals detected by the light receiving units 232 and 233 are processed by the calculation processing unit 201 described later. The material of the light guide 231 is not limited as long as it guides the laser light LB inside the body, but it is, for example, transparent glass or quartz, or a resin such as acrylic or polycarbonate. The light guide 231 is formed in a cylindrical, elliptical, or columnar shape that has a specified length L in the axial direction and can guide light by total reflection. An optical coupling layer 234 is formed on the light guide 231 (see cross-sectional view). The optical coupling layer 234 couples the laser light LB to the light guide 231 using the principles of light diffraction, refraction, scattering, reflection, dispersion, and/or fluorescence (the laser light is not reflected outside the light guide, but is incident on the light guide). The optical coupling layer 234 is formed, for example, by applying a paint having fluorescent particles dispersed in a solution to the surface of the light guide 231, or by providing a resin layer containing fluorescent particles on the surface of the light guide 231.

5, when the laser light LB collides with the light guide 231, at the collision position 235, the laser light LB is coupled into the light guide 231 by the optical coupling layer 234 and split into laser light B1 traveling toward one light receiving unit 232 and laser light B2 traveling toward the other light receiving unit 233 in the opposite direction. If the collision position 235 is the center position M of the light guide 231 in the axial direction, the distance L1 guided by the laser light B1 and the distance L2 guided by the laser light B2 are the same, so the waveforms of the light receiving signals of the light receiving units 232 and 233 match. However, if the collision position 235 is shifted from the center position M of the light guide 231, the distances L1 and L2 guided by the laser light B1 and B2 are different, so that a shift occurs in the waveforms of the light receiving signals of the light receiving units 232 and 233. For example, in FIG. 5, collision position 235 is above center position M of light guide 231, and distance L1 is shorter than distance L2, so a delay occurs in the light receiving signal of light receiving unit 233 relative to the light receiving signal of light receiving unit 232. Calculation processing unit 201 calculates distances L1 and L2 from the time difference or phase difference of these light receiving signals, specified length L, and the light transmission speed of light guide 231 to identify collision position 235. In addition, it calculates which side of center position M collision position 235 is on and the differential distance D from center position M of collision position 235 from specified length L and distance L1 or L2. For example, in FIG. 5, D is calculated from L/2-L1 or L2-L/2.

Figure 6 is a block diagram of the surveying system 1. As described above, the rotary laser device 10 has a rotary head 11 that emits laser light LB. The receiver 20 has an arithmetic processing unit 201, a communication unit 202, a memory unit 203, the above-mentioned light receiving units (of the first vertical light receiving tube 23) 232, 233, light receiving units (of the second vertical light receiving tube 25) 252, 253, light receiving units (of the horizontal light receiving tube 24) 242, 243, and a display operation unit 22. The surveying instrument 30 includes a rotation drive unit 303, which is a motor that rotates the base unit 33 horizontally and the telescope 34 vertically, a distance measurement unit 301 that emits and receives distance measurement light MB to measure the distance to the measurement object, an angle measurement unit 302 that is a rotary encoder that measures the rotation angles of the base unit 33 and the telescope 34 during distance measurement, a control unit 304, a communication unit 305, a storage unit 306, and the above-mentioned main display operation unit 35 and sub-display operation unit 36. The communication unit 305 is capable of wireless communication with the communication unit 202 of the receiver 20, and can use Bluetooth (registered trademark), various wireless LAN standards, infrared communication, mobile phone lines, and other wireless lines.

The rotary laser device 10 and surveying instrument 30 may be of known configuration, so we will explain in detail the configuration of the receiver 20, which is characteristic of this embodiment.

The storage unit 203 includes a RAM and a ROM as main storage devices, and a HDD (Hard Disc Drive) as an auxiliary storage device. The storage unit 203 stores each processing program executed by the arithmetic processing unit 201.

The arithmetic processing unit 201 includes an integrated circuit in which at least a CPU (Central Processing Unit) and memory (RAM (Random Access Memory), ROM (Read Only Memory), etc.) are implemented in an integrated circuit, a collection of integrated circuits, a microcontroller, or a microprocessor.

The calculation processing unit 201 has the functional units of an inclination/height change detection unit 211 and a machine height calculation unit 212. Each functional unit is composed of electronic circuits such as a CPU, an ASIC (Application Specific Integrated Circuit), and a PLD (Programmable Logic Device) such as an FPGA (Field Programmable Gate Array).

The inclination/height change detection unit 211 receives light receiving signals from the light receiving sections 232, 233, 242, 243, 252, 253 (see Figure 2) of the first vertical light receiving tube 23, the horizontal light receiving tube 24, and the second vertical light receiving tube 25, respectively, and detects the respective difference distances D23, D24, D25, including whether they are positive or negative values. The machine height calculation unit 212 calculates the machine height h of the surveying instrument 30 according to the state detected by the inclination/height change detection unit 211. The details are described below.

Figure 7 is a diagram explaining the calculation of the machine height h when the receiver 20 is not tilted. When the receiver 20 is not tilted, as shown in (1) of Figure 7, when the height of the receiver center RC is higher than the laser light LB, the tilt/height change detection unit 211 detects that the collision position 235 of both the first vertical receiver tube 23 and the second vertical receiver tube 25 shifts below the center position M, causing a shift in the light receiving signals at the respective receivers 232, 233 and receivers 252, 253, and detects negative differential distances D23, D25 on the lower receiver 233 (253) side relative to the center position M. As shown in FIG. 7 (2), when the height of the receiver center RC becomes lower than the laser light LB, the tilt/height change detection unit 211 detects that the collision position 235 of both the first vertical receiver tube 23 and the second vertical receiver tube 25 shifts above the center position M, and detects positive differential distances D23 and D25 on the upper receiver unit 232 (252) side relative to the center position M.

In response to this detection, when the inclination/height change detection unit 211 detects negative differential distances D23, D25 from the first vertical light receiving tube 23 and the second vertical light receiving tube 25, the machine height calculation unit 212 calculates the machine height h from Equation 1 using the height H of the laser light LB, the differential distance D23 (or D25) detected by the vertical light receiving tubes 23, 25, and the central separation distance d1 between the light receiving device center RC and the machine center MC, as shown in Fig. 7 (1). However, an absolute value is used for D23 (D25).
or

On the other hand, when the inclination/height change detection unit 211 detects positive differential distances D23, D25 from the first vertical light receiving tube 23 and the second vertical light receiving tube 25, the machine height calculation unit 212 calculates the machine height h from equation 2 using the height H of the laser light LB, the differential distance D23 (or D25) detected by the vertical light receiving tubes 23, 25, and the central distance d1 between the light receiving center RC and the machine center MC, as shown in (2) of Figure 7.
or

In addition, in formulas 1 and 2, when the handle 27 is slid, the value of the center distance d1 is updated from the display operation unit 22 according to the position of the handle 27.

8 and 9 are diagrams explaining the calculation of the machine height h when the receiver 20 is tilted. When the receiver 20 is tilted to the left as shown in (1) of Fig. 8, the tilt/height change detection unit 211 detects that the collision position 235 in the first vertical receiver tube 23 has shifted above the center position M, and detects a positive difference distance D23 on the side of the receiver 232 above the center position M, while the collision position 235 in the second vertical receiver tube 25 has shifted below the center position M, and detects a negative difference distance D25 on the side of the receiver 253 below the center position M. When the light receiver 20 is tilted to the right as shown in FIG. 8 (2), the first vertical light receiving tube 23 detects a negative difference distance D23 toward the lower light receiving unit 233 side relative to the center position M, and the second vertical light receiving tube 25 detects a positive difference distance D25 toward the upper light receiving unit 252 side relative to the center position M, as the collision position 235 shifts below the center position M. At this time, it is understood that the difference distance D23 (D25) becomes longer as the left-right tilt increases, and the difference distance D23 (D25) and the value of the tilt angle δ correspond one-to-one. Therefore, by storing a left-right tilt detection table 342 (see FIG. 8) that stores the correspondence between the difference distance D23 (D25) and the left-right tilt angle δ in the storage unit 203, the left-right tilt angle δ can be calculated according to the value of the difference distance. FIG. 8 illustrates the left-right tilt detection table 342 when the resolution is set to 0.5 mm units. In the left-right tilt detection table 342, the center position M of the vertical light receiving tube 23 (25) is set to 0 [mm], the difference distance D23 (D25) detected on the upper light receiving unit 232 (252) side across the center position M is set as a positive value, and the difference distance D23 (D25) detected on the lower light receiving unit 233 (253) side across the center position M is set as a negative value, and the tilt angle δ corresponding to each difference distance D23 (D25) is stored.

With the left light receiving unit 242 side and the right light receiving unit 243 side being negative and positive, respectively, with respect to the center position M of the horizontal light receiving tube 24, the tilt/height change detection unit 211 detects a positive difference distance D24 on the light receiving unit 243 side when the light receiver 20 is tilted to the left and the collision position 235 is shifted above the light receiver center RC as shown in Fig. 9(1). When the light receiver 20 is tilted to the left and the collision position 235 is shifted below the light receiver center RC as shown in Fig. 9(2), the tilt/height change detection unit 211 detects a negative difference distance D24 on the light receiving unit 242 side. When the light receiver 20 is tilted to the right and the collision position 235 is shifted above the light receiver center RC as shown in Fig. 9(3), the tilt/height change detection unit 211 detects a negative difference distance D24 on the light receiving unit 242 side. 9(4), when the receiver 20 is tilted to the right and the collision position 235 is shifted below the receiver center RC, a positive differential distance D24 is detected on the receiver 243 side. The height change amount Δd of the receiver center RC is calculated from Equation 3 using trigonometric functions. However, in Equation 3, D24 uses an absolute value.

where Δd is the change in height, D24 is the difference in distance detected by the horizontal receiver tube, and δ is the inclination angle of the laser receiver in the left-right direction.

In response to this detection, the machine height calculation unit 212 determines whether the inclination/height change detection unit 211 detects that the difference distance D23 of the first vertical light receiving tube 23 is a positive value, the difference distance D25 of the second vertical light receiving tube 25 is a negative value, and the difference distance D24 of the horizontal light receiving tube 24 is a positive value, as described in FIG. 9 (1), or that the difference distance D23 of the first vertical light receiving tube 23 is a negative value and the difference distance D25 of the second vertical light receiving tube 25 is a negative value, as described in FIG. 9 (3). When the differential distance D25 of the light tube 25 is detected as a positive value and the differential distance D24 of the horizontal light receiving tube 24 is detected as a negative value, the light receiving center RC is below the laser light LB, and the mechanical height h of the surveying instrument 30 can be calculated from Equation 4 using the height H of the laser light LB, the center distance d1 between the light receiving center RC and the mechanical center MC, and the height change amount Δd of the light receiving center RC, which can be obtained from Equation 3 using the differential distance D24 of the horizontal light receiving tube 24.

On the other hand, when the inclination/height change detection unit 211 detects that the difference distance D23 of the first vertical light receiving tube 23 is a positive value, the difference distance D25 of the second vertical light receiving tube 25 is a negative value, and the difference distance D24 of the horizontal light receiving tube 24 is a negative value, as described in (2) of FIG. 9, or when the difference distance D23 of the first vertical light receiving tube 23 is a negative value, the difference distance D25 of the second vertical light receiving tube 25 is a negative value, and the difference distance D24 of the horizontal light receiving tube 24 is a negative value, as described in (4) of FIG. When the differential distance D25 of the horizontal receiver tube 24 is detected as a positive value and the differential distance D24 of the horizontal receiver tube 24 is detected as a positive value, the receiver center RC is above the laser light LB, and the mechanical height h of the surveying instrument 30 can be calculated from equation 5 using the height H of the laser light LB, the center-to-center distance d1 between the receiver center RC and the mechanical center MC, and the height change Δd of the receiver center RC, which can be obtained from equation 3 using the differential distance D24 of the horizontal receiver tube 24.

In addition, in formulas 4 and 5, when the handle 27 is slid, the value of the center distance d1 is updated from the display operation unit 22 according to the position of the handle 27.

When the machine height calculation unit 212 measures the machine height h from formula 1, formula 2, formula 4, or formula 5, it transmits it to the surveying instrument 30 via the communication unit 202. The surveying instrument 30 receives it via the communication unit 305 and stores it in the memory unit 306.

As described above, according to the surveying system 1 of this embodiment, the laser receiver 20, which has a first vertical light receiving tube 23, a second vertical light receiving tube 25, and a horizontal light receiving tube 24 arranged in an H-shape as light receiving sensors, is integrated with the surveying instrument 30 in an aligned state, and the positive/negative detection patterns of each light receiving signal of the receiver 20 are observed, and the mechanical height of the surveying instrument 30 can be accurately measured according to each detection pattern.

The rotary laser device 10 and the receiver 20 used in this surveying system 1 are commonly used at surveying sites for leveling purposes, and the surveying instrument 30 is commonly used at surveying sites for measuring the coordinates of measurement points. In this embodiment of the surveying system 1, the mechanical height of the surveying instrument 30 can be easily measured by attaching the receiver 20, which is prepared at the surveying site for leveling purposes, to the surveying instrument 30.

In addition, the receiver 20 and the surveying instrument 30 can be attached and detached using the handle 27 of the receiver 20 and the hook 37 of the surveying instrument 30, so the receiver 20 can be attached to the surveying instrument 30 only when measuring the machine height, and can be removed once the measurement of the machine height is completed. When removed, the receiver 20 and the surveying instrument 30 can be conveniently returned to their normal use.

The above describes preferred embodiments and modifications of the present invention, but the above is merely an example of the present invention, and these can be combined based on the knowledge of those skilled in the art, and such combinations are also included in the scope of the present invention.

REFERENCE SIGNS LIST 1 Survey system 10 Rotary laser device 11 Rotating head 12 Horizontal reference surface 20 Laser receiver 21 Case 22 Display/operation unit 23 First vertical light receiving tube 231 Light guide 232 Light receiving unit 233 Light receiving unit
234 Optical coupling layer 235 Collision position 24 Horizontal light receiving tube 242 Light receiving section 243 Light receiving section 25 Second vertical light receiving tube 252 Light receiving section 253 Light receiving section 27 Handle 28 Storage recess 29 Slide lock mechanism 201 Processing section 202 Communication section 203 Storage section
211 Tilt/height detection unit 212 Machine height calculation unit 30 Surveying instrument 31 Leveling platform 32 Base unit 33 Support unit 34 Telescope 35 Main display operation unit 36 Sub-display operation unit 37 Hook 301 Distance measurement unit 302 Angle measurement unit 303 Rotation drive unit 304 Arithmetic and control unit 305 Communication unit 306 Memory unit MC Machine center d1 Center distance LB Laser light RC Light receiver center

Claims (6)

A rotary laser device that emits a laser beam horizontally at a certain height from a certain measurement reference point;
A surveying instrument installed at another measurement reference point and having a machine height to a machine center;
a laser receiver fixed to a front surface of the surveying instrument and configured to receive the laser light;
The laser receiver includes a columnar light guide as a light receiving sensor, light receiving units arranged at both ends of the light guide, and an optical coupling layer that divides the laser light toward both ends of the light guide, and includes a first vertical light receiving tube, a second vertical light receiving tube, and a horizontal light receiving tube arranged in an H shape, and a calculation processing unit connected to the light receiving units.
The arithmetic processing unit is
identifying a collision position of the laser light from each light receiving signal of the light receiving unit, and detecting a difference distance from the center position of the collision position and whether the difference distance is on the positive side or the negative side of the center position of the length of the light guide;
A surveying system characterized by measuring the mechanical height of the surveying instrument from the height of the laser light, the vertical center distance between the receiver center of the receiver and the mechanical center of the surveying instrument, and the differential distance according to the plus/minus combination of the differential distance of the first vertical receiver tube, the second vertical receiver tube, and the horizontal receiver tube.
The arithmetic processing unit is
When the difference distance between the first vertical light receiving tube and the second vertical light receiving tube is the same and both are negative values, the machine height is calculated from the sum of the difference distance, the height of the laser light, and the center distance;
The surveying system according to claim 1, characterized in that when the differential distance between the first vertical light receiving tube and the second vertical light receiving tube is the same and both are positive values, the absolute value of the differential distance is subtracted from the sum of the height of the laser light and the center distance to calculate the machine height.
The arithmetic processing unit is
When the difference distance of the first vertical light receiving tube is a positive value, the difference distance of the second vertical light receiving tube is a negative value, and the difference distance of the horizontal light receiving tube is a positive value, or when the difference distance of the first vertical light receiving tube is a negative value, the difference distance of the second vertical light receiving tube is a positive value, and the difference distance of the horizontal light receiving tube is a negative value, the change in height of the light receiving device center calculated from a trigonometric function of the absolute value of the difference distance of the horizontal light receiving tube is subtracted from the sum of the height of the laser light and the center distance to calculate the machine height;
The surveying system according to claim 1, characterized in that when the differential distance of the first vertical light receiving tube is a positive value, the differential distance of the second vertical light receiving tube is a negative value, and the differential distance of the horizontal light receiving tube is a negative value, or when the differential distance of the first vertical light receiving tube is a negative value, the differential distance of the second vertical light receiving tube is a positive value, and the differential distance of the horizontal light receiving tube is a positive value, the machine height is calculated from the sum of the height change of the center of the light receiver obtained from the trigonometric function of the absolute value of the differential distance of the horizontal light receiving tube, the height of the laser light, and the center distance.
The surveying system described in claim 1, characterized in that a pair of left and right handles extending rearward are provided on the rear surface of the laser receiver so as to be slidably locked in the vertical direction, and the center distance is fixed by fixing the handles to hooks provided on the surveying instrument.
3. The surveying system according to claim 2, wherein a housing recess is formed on a rear surface of said laser receiver to avoid interference with a display operation unit and a telescope provided on said surveying instrument.
A laser receiver that receives a laser beam emitted horizontally at a certain height from a certain measurement reference point and is fixed to the front of a surveying instrument installed at another measurement reference point,
The laser receiver includes a columnar light guide as a light receiving sensor, light receiving units arranged at both ends of the light guide, and an optical coupling layer that divides the laser light toward both ends of the light guide, and includes a first vertical light receiving tube, a second vertical light receiving tube, and a horizontal light receiving tube arranged in an H shape, and a calculation processing unit connected to the light receiving units.
The arithmetic processing unit is
identifying a collision position of the laser light from each light receiving signal of the light receiving unit, and detecting a difference distance from the center position of the collision position and whether the difference distance is on the positive side or the negative side of the center position of the length of the light guide;
A laser receiver characterized by measuring the mechanical height of the surveying instrument from the height of the laser light, the vertical center distance between the receiver center of the receiver and the mechanical center of the surveying instrument, and the differential distance, depending on the plus/minus combination of the differential distance of the first vertical receiver tube, the second vertical receiver tube, and the horizontal receiver tube.